Radiant|Lab Grown|IGI

1.28ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG731537069

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG731537069

Diamond specifications and retailer prices

From $235 USD
As of November 4, 2026
Save $1,785 USD (88%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $2,450 USD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.28ct lab-grown radiant diamond

This 1.28ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG731537069 or 731537069. Listed at 16 retailers as of November 4, 2026, with a 760% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41°
Pavilion angle34.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731537069
Dimensions7.61 × 5.54 × 3.54 mm
L/W Ratio1.37
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.61 mm5.54 mm1.28 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731537069
Side View
Table 67.0%Crown 41°Girdle: Slightly ThickPavilion 34.7°Culet: NoneDepth 63.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $2,450 USD|Low: $195 USD|High: $2,530 USD|Avg: $942 USD|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 4, 2026
Retailer 16$209 USD
Retailer 14$235 USD
Retailer 7$243 USD
Retailer 5$317 USD
Retailer 3$354 USD
Retailer 8$462 USD
Retailer 2$544 USD
Retailer 12$656 USD
Retailer 15$698 USD
Retailer 17$755 USD
Retailer 6$890 USD
Retailer 4$920 USD
Retailer 13$1,106 USD
Retailer 10$1,156 USD
Retailer 9$1,955 USD
Retailer 11$2,020 USD
Brilliant Earth$2,450 USD

37 data points across 17 retailers

16 retailers$235 USD to $2,020 USD

Retailer 1
-
$209 USD
Price last confirmed 8 days ago
A
Retailer 2
-
$235 USD
View
Final sale: no returns
Retailer 3
-
$243 USD
View
Price last confirmed 7 days ago
A
Retailer 4
-
$317 USD
View
B+
Retailer 5
-
$354 USD
View
A
Retailer 6
-
$544 USD
View
A
Retailer 7
-
$656 USD
View
Retailer 8
-
$698 USD
View
Price last confirmed 8 days ago
Retailer 9
-
$755 USD
View
Price last confirmed 9 days ago
Retailer 10
-
$890 USD
View
Price last confirmed 8 days ago
Retailer 11
-
$920 USD
View
Price last confirmed 10 days ago
B+
Retailer 12
-
$1,106 USD
View
B+
Retailer 13
-
$1,156 USD
View
Retailer 14
-
$1,955 USD
View
Price last confirmed 17 days ago
B
Retailer 15
-
$2,020 USD
View
Most Expensive
Brilliant Earth
21405859Y · Oct 28
$2,450 USD
View
Price last confirmed 7 days ago
15 more retailers have this diamond
Prices start from $235 USDSave up to $1,785 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.28ct Radiant
$235 USD